Claudio Contreras / Pink abalone (Haliotis corrugata) shell detail, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, January

Claudio Contreras / Pink abalone (Haliotis corrugata) shell detail, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, January

Claudio Contreras / Pink abalone (Haliotis corrugata) shell detail, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, January

Sergio Hanquet / Green ormer (Haliotis tuberculata coccinea) on sea floor. Tenerife, Canary Islands.

Sergio Hanquet / Green ormer (Haliotis tuberculata coccinea) on sea floor. Tenerife, Canary Islands.

Sergio Hanquet / Green ormer (Haliotis tuberculata coccinea). Tenerife, Canary Islands.

Sergio Hanquet / Green ormer (Haliotis tuberculata coccinea). Tenerife, Canary Islands.

Sergio Hanquet / Green ormer (Haliotis tuberculata coccinea). Tenerife, Canary Islands.

Paul D Stewart / Ammonite (Cosmoceras proniae) from Jurrasic period, 165 million years ago, from Russia. Shown ithin the shell of modern Abalone (Haliotis sp.) This illustrates the preservation in the ammonite fossil...

Adrian Davies / Mother of Pearl, inside of Ormer shell (Haliotis)

Ingo Arndt / Green Abalone (Haliotis fulgens) shell interior from Baja California, Collection Meeresmuseum Ozeania, Riedenburg, Germany

Ingo Arndt / Blood-spotted Abalone (Haliotis spadicea) shell, Meeresmuseum Ozeania, Riedenburg, Germany